Journal articles: 'Sky Shark'

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Jacoby, David M. P. "An eye in the sky reveals the collective dynamics of free-ranging shark aggregations." Journal of Fish Biology 94, no. 1 (January 2019): 3. http://dx.doi.org/10.1111/jfb.13877.

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Katsianis, Antonios, Haojie Xu, Xiaohu Yang, Yu Luo, Weiguang Cui, Romeel Davé, Claudia Del P. Lagos, Xianzhong Zheng, and Ping Zhao. "The specific star formation rate function at different mass scales and quenching: a comparison between cosmological models and SDSS." Monthly Notices of the Royal Astronomical Society 500, no. 2 (October 22, 2020): 2036–48. http://dx.doi.org/10.1093/mnras/staa3236.

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ABSTRACT We present the eddington bias corrected specific star formation rate function (sSFRF) at different stellar mass scales from a sub-sample of the Sloan Digital Sky Survey Data Release DR7 (SDSS), which is considered complete both in terms of stellar mass (M⋆) and star formation rate (SFR). The above enable us to study qualitatively and quantitatively quenching, the distribution of passive/star-forming galaxies and perform comparisons with the predictions from state-of-the-art cosmological models, within the same M⋆ and SFR limits. We find that at the low-mass end (${M_{\star }} = 10^{9.5}\!-\!10^{10} \, {\rm M_{\odot }}$) the sSFRF is mostly dominated by star-forming objects. However, moving to the two more massive bins (${M_{\star }} = 10^{10}\!-\!10^{10.5} \, {\rm M_{\odot }}$ and ${M_{\star }} = 10^{10.5}\!-\!10^{11} \, {\rm M_{\odot }}$) a bi-modality with two peaks emerges. One peak represents the star-forming population, while the other describes a rising passive population. The bi-modal form of the sSFRFs is not reproduced by a range of cosmological simulations (e.g. Illustris, EAGLE, Mufasa, and IllustrisTNG) which instead generate mostly the star-forming population, while a bi-modality emerges in others (e.g. L-Galaxies, Shark, and Simba). Our findings reflect the need for the employed quenching schemes in state-of-the-art models to be reconsidered, involving prescriptions that allow ‘quenched galaxies’ to retain a small level of SF activity (sSFR = ${\rm 10^{-11} \, }$–${\rm 10^{-12} \, {\rm yr^{-1}}}$) and generate an adequate passive population/bi-modality even at intermediate masses (${M_{\star }} = 10^{10}\!-\!10^{10.5} \, {\rm M_{\odot }}$).

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Hu, Wenkai, Barbara Catinella, Luca Cortese, Lister Staveley-Smith, Claudia del P. Lagos, Garima Chauhan, Tom Oosterloo, and Xuelei Chen. "The cosmic atomic hydrogen mass density as a function of mass and galaxy hierarchy from spectral stacking." Monthly Notices of the Royal Astronomical Society 493, no. 2 (February 3, 2020): 1587–95. http://dx.doi.org/10.1093/mnras/staa257.

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ABSTRACT We use spectral stacking to measure the contribution of galaxies of different masses and in different hierarchies to the cosmic atomic hydrogen (H i) mass density in the local Universe. Our sample includes 1793 galaxies at z < 0.11 observed with the Westerbork Synthesis Radio Telescope, for which Sloan Digital Sky Survey spectroscopy and hierarchy information are also available. We find a cosmic H i mass density of $\Omega _{\rm H\, \small {I} } = (3.99 \pm 0.54)\times 10^{-4} \, h_{70}^{-1}$ at 〈 z〉 = 0.065. For the central and satellite galaxies, we obtain $\Omega _{\rm H\, {\small {I}}}$ of $(3.51 \pm 0.49)\times 10^{-4} \, h_{70}^{-1}$ and $(0.90 \pm 0.16)\times 10^{-4} \, h_{70}^{-1}$, respectively. We show that galaxies above and below stellar masses of ∼109.3 M⊙ contribute in roughly equal measure to the global value of $\Omega _{\rm H\, \small {I} }$. While consistent with estimates based on targeted H i surveys, our results are in tension with previous theoretical work. We show that these differences are, at least partly, due to the empirical recipe used to set the partition between atomic and molecular hydrogen in semi-analytical models. Moreover, comparing our measurements with the cosmological semi-analytic models of galaxy formation Shark and GALFORM reveals gradual stripping of gas via ram pressure works better to fully reproduce the properties of satellite galaxies in our sample than strangulation. Our findings highlight the power of this approach in constraining theoretical models and confirm the non-negligible contribution of massive galaxies to the H i mass budget of the local Universe.

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Thomas, Helene. "My Share of the Sky: Review 1." RadioDoc Review 1, no. 2 (2014): 1–8. http://dx.doi.org/10.14453/rdr.v1i2.8.

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Hall, Alan. "My Share of the Sky: Review 2." RadioDoc Review 1, no. 2 (2014): 1–7. http://dx.doi.org/10.14453/rdr.v1i2.9.

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Lane, I. William. "Having My Say: Shark Cartilage Therapy." Alternative and Complementary Therapies 1, no. 4 (June 1995): 238–42. http://dx.doi.org/10.1089/act.1995.1.238.

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Hope, Joan. "Rely on data to set, share strategy." Student Affairs Today 21, no. 8 (October 19, 2018): 12. http://dx.doi.org/10.1002/say.30541.

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Jain, Sharad K., and Vijay P. Singh. "Lightning paths in sky share similarities with channel networks on Earth." Eos, Transactions American Geophysical Union 85, no. 26 (2004): 249. http://dx.doi.org/10.1029/2004eo260001.

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Hunter, Tim B., David L. Crawford, Libby Howell, and Daniel G. Knauss. "The International Dark-Sky Association, Inc." International Astronomical Union Colloquium 112 (1991): 110. http://dx.doi.org/10.1017/s0252921100003845.

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ABSTRACTThe International Dark-Sky Association, Inc. (or IDA, Inc.) is a new tax-exempt, non-profit corporation formed to serve the public and the amateur and professional astronomer communities by providing information, education, and research on light pollution and related topics. IDA will share knowledge of the issue on a local, national, and international basis and will assist with members’ problems. It was organized for the purpose of preserving dark skies for astronomy and for the general public. Solutions to the problem of light pollution will, at the same time, also promote maximum effectiveness for all outdoor lighting and will conserve natural resources.

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Petrenko, B., A. Ignatov, Y. Kihai, and A. Heidinger. "Clear-Sky Mask for the Advanced Clear-Sky Processor for Oceans." Journal of Atmospheric and Oceanic Technology 27, no. 10 (October 1, 2010): 1609–23. http://dx.doi.org/10.1175/2010jtecha1413.1.

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Abstract The Advanced Clear Sky Processor for Oceans (ACSPO) generates clear-sky products, such as SST, clear-sky radiances, and aerosol, from Advanced Very High Resolution Radiometer (AVHRR)-like measurements. The ACSPO clear-sky mask (ACSM) identifies clear-sky pixels within the ACSPO products. This paper describes the ACSM structure and compares the performances of ACSM and its predecessor, Clouds from AVHRR Extended Algorithm (CLAVRx). ACSM essentially employs online clear-sky radiative transfer simulations enabled within ACSPO with the Community Radiative Transfer Model (CRTM) in conjunction with numerical weather prediction atmospheric [Global Forecast System (GFS)] and SST [Reynolds daily high-resolution blended SST (DSST)] fields. The baseline ACSM tests verify the accuracy of fitting observed brightness temperatures with CRTM, check retrieved SST for consistency with Reynolds SST, and identify ambient cloudiness at the boundaries of cloudy systems. Residual cloud effects are screened out with several tests, adopted from CLAVRx, and with the SST spatial uniformity test designed to minimize misclassification of sharp SST gradients as clouds. Cross-platform and temporal consistencies of retrieved SSTs are maintained by accounting for SST and brightness temperature biases, estimated within ACSPO online and independently from ACSM. The performance of ACSM is characterized in terms of statistics of deviations of retrieved SST from the DSST. ACSM increases the amount of “clear” pixels by 30% to 40% and improves statistics of retrieved SST compared with CLAVRx. ACSM is also shown to be capable of producing satisfactory statistics of SST anomalies if the reference SST field for the exact date of observations is unavailable at the time of processing.

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Mittal, Amit, and Sahil Gupta. "Vistara: Aiming for the Sky." South Asian Journal of Business and Management Cases 9, no. 1 (January 22, 2020): 138–47. http://dx.doi.org/10.1177/2277977919881419.

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Vistara—a joint venture between Tata Sons (India) and Singapore Airlines (Singapore)—is a full-service private airline in India that launched operations in January 2015. The airline has been growing at a steady pace and has already won a number of awards, but going forward it shall have a number of challenges to confront, especially on how to increase its market share in an industry dominated by low-cost carriers and prone to uncertainties emerging from external factors beyond its control (e.g., fuel prices and an uncertain political environment). To further complicate issues, Indian aviation, despite being among the fastest growing aviation markets across the world, is still making heavy losses. For Vistara, a lot is at stake considering that the airline is backed by two major reputable organizations. In the times to come, the airline will have to learn how to navigate the complex aviation environment and seeks ways to live up to its name, which means limitless expanse.

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Neumann, Hans L. "Popularizing Astronomy at Public Observatories in West Germany." International Astronomical Union Colloquium 105 (1990): 347–49. http://dx.doi.org/10.1017/s0252921100087133.

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Based on the pedagogical ideas of A. Diesterweg, a number of science associations have been founded since about 1880 under the name of URANIA; astronomy has been one of their subjects. In the 1920–1930’s, the works of Bruno H. Bürgel and Robert Henseling initiated the founding of many more local and regional associations and of public observatories all over the country. But most of the currently active associations were founded to answer the sharp increase of general interest that followed the early successes and spectacular results of space science.- Aims of the associations always have been manyfold:- to share a fine hobby with like-minded people;- to participate theoretically or practically in scientific research as far as technical and local circumstances allow;- to offer to the public means and advice for celestial observations, and to share the joy of deep-sky wonders with guests;- to mediate the progress, and the results of astronomical research to the public.

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Lipley, Nick. "Nurses say new members won’t share RCN’s values." Nursing Standard 14, no. 52 (September 14, 2000): 5. http://dx.doi.org/10.7748/ns.14.52.5.s8.

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Butterley, T., G. D. Love, R. W. Wilson, R. M. Myers, and T. J. Morris. "A Shack-Hartmann wavefront sensor projected on to the sky with reduced focal anisoplanatism." Monthly Notices of the Royal Astronomical Society 368, no. 2 (May 11, 2006): 837–43. http://dx.doi.org/10.1111/j.1365-2966.2006.10160.x.

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Ammarell, Gene. "Sky Calendars of the Indo-Malay Archipelago." International Astronomical Union Colloquium 91 (1987): 241–47. http://dx.doi.org/10.1017/s0252921100106116.

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Research conducted over the past several years has revealed a richly diverse astronomical tradition in the Indo-Malay cultural area. I wish, in this paper, to share some of this richness by describing several of the many and diverse observational techniques used by the Indo-Malay peoples to help regulate their agricultural cycles.Inhabiting mountain sides, river valleys, and coastal plains, the Indo-Malay peoples are faced with a rather unpredictable tropical monsoon climate. In response to this geography and climate they have adopted two distinct types of rice farming: swidden and padi, or dry and wet.Padi farming is sedentary and relies upon heavy monsoon rains and/or irrigation for the rather large and dependable supply of water required: rice plants must be submerged from the time that they are planted in the nursery through transplanting and until seed is set. From thereon, dry weather is essential for the seed to properly ripen. Padi fanning is widely practiced on coastal plains and terraced hillsides by people such as the Javanese, the Sasak of Lombok, and the Malays of Kedah and Perak.

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Ryan, Irene. "From “blue sky” to real world research." Qualitative Research in Organizations and Management: An International Journal 13, no. 3 (September 10, 2018): 235–49. http://dx.doi.org/10.1108/qrom-10-2016-1452.

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Purpose The purpose of this paper is to share reflective insights on three key questions of concern to critical diversity scholars: what influences play a part in framing a research project and the research questions, what determines the chosen methodology and what knowledge contributions do we want our research to make? Design/methodology/approach The paper, drawing on organisational ethnography, incorporates key fieldwork experiences to provide reflective insights on an innovative research project design conducted in multiple organisation sites. Findings The paper highlights the author’s learning from the conceptualisation of an innovative research project to the actual “doing” of what was proposed. It reflects on the unforeseen dilemmas that required continual adaptations be made because of the shifting demands of the research settings. Practical implications The paper is important as it provides the sharing of ideas into the influences that shaped a major piece of externally funded research and highlights a range of practical considerations if planning a critical diversity research project where negotiating access to organisations is required. Originality/value By reflecting on some important learning and insights into the crafting of an innovative research project and the challenges of enacting what was proposed, the paper is of value to post-doctoral and early career scholars and/or researchers interested in some insights into operationalising an organisational ethnographic methodology.

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Rubenstein, Rheta. "For The Editorial Panel: Share the Wealth, Share the Wisdom." Mathematics Teacher 88, no. 6 (September 1995): 444. http://dx.doi.org/10.5951/mt.88.6.0444.

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Flying magazine has a column called “I Learned about Flying from That.” Each month a pilot tells a personal flying story involving a “close call” from which he or she learned an important safety lesson. The brief, firsthand, suspenseful stories are a great way to share learning about safety. Do we as teachers not have the same types of stories—critical incidents that affected our growth significantly? Life is too short for us each to learn everything firsthand. We, like pilots, increase our wisdom when we learn from one another. The Editorial Panel of the Mathematics Teacher believes that we all have stories to tell, whether they stem from the throes of the early years of teaching, the results of carefully orchestrated lessons, or the unexpected surprises of students' insights. We have stories that tell how we learned from our students: how a student's comment, question, or response to an! activity taught us an important lesson about learning, mathematics, or teaching. Each of us has stories for which we can say, “I learned about teaching from that!” We invite you to share yours.

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Curtis, Tobey H., Stephan I. Zeeman, Erin L. Summers, Steven X. Cadrin, and Gregory B. Skomal. "Eyes in the sky: linking satellite oceanography and biotelemetry to explore habitat selection by basking sharks." Animal Biotelemetry 2, no. 1 (2014): 12. http://dx.doi.org/10.1186/2050-3385-2-12.

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Al Ibrahim, Daleen, and Yibin Shi. "Framing terrorism: A comparative content analysis of ISIS news on RT Arabic and Sky News Arabia websites." Journal of Arab & Muslim Media Research 13, no. 2 (September 1, 2020): 215–34. http://dx.doi.org/10.1386/jammr_00020_1.

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This study compares RT Arabic and Sky News Arabia websites in their coverage of the Islamic State of Iraq and Syria violent organization known as ISIS from 1 June 2014 until 30 June 2016, in terms of framing type and the image reflected about ISIS. The quantitative content analysis of the news articles shows similarities and few differences in the news coverage of ISIS. The study suggests that RT and Sky News share a few features in framing ISIS but still differ significantly. The two websites adopt mainly the conflict frame in presenting ISIS issues; however, they report ISIS differently when it comes to violence and human interest frames. The findings also reveal that RT and Sky News differ partially in the image reflected about ISIS on their websites. RT has exaggerated ISIS’s image more distinctly than Sky News. Besides, even though threat is the most dominant discourse about ISIS in the two websites, RT promotes ISIS as powerful and exaggerates its strength in its coverage more than Sky News.

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Quisi, Q. "Communication improvement in the team-work: from say to share." European Psychiatry 17 (May 2002): 198. http://dx.doi.org/10.1016/s0924-9338(02)80846-x.

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Niccolai, Alessandro, and Alfredo Nespoli. "Sun Position Identification in Sky Images for Nowcasting Application." Forecasting 2, no. 4 (November 16, 2020): 488–504. http://dx.doi.org/10.3390/forecast2040026.

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Very-short-term photovoltaic power forecast, namely nowcasting, is gaining increasing attention to face grid stability issues and to optimize microgrid energy management systems in the presence of large penetration of renewable energy sources. In order to identify local phenomena as sharp ramps in photovoltaic production, whole sky images can be used effectively. The first step in the implementation of new and effective nowcasting algorithms is the identification of Sun positions. In this paper, three different techniques (solar angle-based, image processing-based, and neural network-based techniques) are proposed, described, and compared. These techniques are tested on real images obtained with a camera installed at SolarTechLab at Politecnico di Milano, Milan, Italy. Finally, the three techniques are compared by introducing some performance parameters aiming to evaluate of their reliability, accuracy, and computational effort. The neural network-based technique obtains the best performance: in fact, this method is able to identify accurately the Sun position and to estimate it when the Sun is covered by clouds.

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Canady, Valerie A. "Florida law requiring students to share MH information troubling, say advocates." Mental Health Weekly 28, no. 29 (July 30, 2018): 1–7. http://dx.doi.org/10.1002/mhw.31534.

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Trottier, Kim. "What does the market say about say-on-pay? A look at the Canadian bank experience." Journal of Governance and Regulation 1, no. 3 (2012): 142–55. http://dx.doi.org/10.22495/jgr_v1_i3_c2_p1.

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This paper explores the share price reaction to a recent news announcement that Canadian banks were adopting say-on-pay, a policy that gives shareholders an annual non-binding vote on executive compensation. Using event study methodology, the effect of adopting this new policy is explored and found to be associated with a significant increase in share price. This result suggests that giving shareholders a voice on executive compensation is expected to generate economic benefits, which adds to the paucity of knowledge currently available to shareholders and legislators as they consider the consequences of say-on-pay.

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Hauser, M. G., T. Kelsall, H. Moseley, R. Silverberg, T. L. Murdock, J. C. Mather, G. Smoot, R. Weiss, and E. L. Wright. "The Status of the Dirbe Instrument on the COBE." International Astronomical Union Colloquium 123 (1990): 19. http://dx.doi.org/10.1017/s0252921100076843.

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AbstractThe Diffuse Infrared-Background Experiment (DIRBE) on the Cosmic Background Explorer (COBE) satellite is a 10-band absolute photometer covering the wavelengths 1–300 microns using photovoltaic, photoconductive, and bolometric detectors. The input is via a 19-cm, off-axis, highly-baffled Gregorian telescope, with the detectors located at a pupil plane so they share the same field of view (0.7 × 0.7 degrees). The whole assembly is mounted inside a 1.4 K; super-fluid, liquid-He dewar, which is shared with the Far Infrared Absolute Spectrometer (FIRAS) instrument. Each day half of the sky is surveyed, as the line-of-sight of the DIRBE is canted 30 degrees to the COBE spin axis. The whole sky is fully observed in 6 months, as the spin axis precesses at about 1 degree per day. At present each sky pixel has been observed at least once. The basic findings on the general brightness of the sky - Zodiacal light and galaxy - are provided, as well as a synopsis of the advantages and disadvantages associated with a space-borne observatory. The relationship of our experience and findings with respect to possible future missions and their scientific goals is presented.

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Priyatikanto, Rhorom, Lidia Mayangsari, Rudi A. Prihandoko, and Agustinus G. Admiranto. "Classification of Continuous Sky Brightness Data Using Random Forest." Advances in Astronomy 2020 (April 1, 2020): 1–11. http://dx.doi.org/10.1155/2020/5102065.

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Sky brightness measuring and monitoring are required to mitigate the negative effect of light pollution as a byproduct of modern civilization. Good handling of a pile of sky brightness data includes evaluation and classification of the data according to its quality and characteristics such that further analysis and inference can be conducted properly. This study aims to develop a classification model based on Random Forest algorithm and to evaluate its performance. Using sky brightness data from 1250 nights with minute temporal resolution acquired at eight different stations in Indonesia, datasets consisting of 15 features were created to train and test the model. Those features were extracted from the observation time, the global statistics of nightly sky brightness, or the light curve characteristics. Among those features, 10 are considered to be the most important for the classification task. The model was trained to classify the data into six classes (1: peculiar data, 2: overcast, 3: cloudy, 4: clear, 5: moonlit-cloudy, and 6: moonlit-clear) and then tested to achieve high accuracy (92%) and scores (F-score = 84% and G-mean = 84%). Some misclassifications exist, but the classification results are considerably good as indicated by posterior distributions of the sky brightness as a function of classes. Data classified as class-4 have sharp distribution with typical full width at half maximum of 1.5 mag/arcsec2, while distributions of class-2 and -3 are left skewed with the latter having lighter tail. Due to the moonlight, distributions of class-5 and -6 data are more smeared or have larger spread. These results demonstrate that the established classification model is reasonably good and consistent.

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Valach, P. "The share of participation of the intellectual skills in the process of motor learning." Studia Kinanthropologica 12, no. 2 (September 30, 2011): 103–7. http://dx.doi.org/10.32725/sk.2011.029.

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Bará, S., Á. Rodríguez-Arós, M. Pérez, B. Tosar, RC Lima, A. Sánchez de Miguel, and J. Zamorano. "Estimating the relative contribution of streetlights, vehicles, and residential lighting to the urban night sky brightness." Lighting Research & Technology 51, no. 7 (October 29, 2018): 1092–107. http://dx.doi.org/10.1177/1477153518808337.

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Under stable atmospheric conditions the brightness of the urban sky varies throughout the night following the time course of the anthropogenic emissions of light. Different types of artificial light sources (e.g. streetlights, residential, and vehicle lights) have specific time signatures, and this feature makes it possible to estimate the amount of brightness contributed by each of them. Our approach is based on transforming the time representation of the zenithal night sky brightness into a modal expansion in terms of the time signatures of the different sources of light. The modal coefficients, and hence the absolute and relative contributions of each type of source, can be estimated by means of a linear least squares fit. A practical method for determining the time signatures of different contributing sources is also described, based on wide-field time-lapse photometry of the urban nightscape. Our preliminary results suggest that, besides the dominant streetlight contribution, artificial light leaking out of the windows of residential buildings may account for a significant share of the time-varying part of the zenithal night sky brightness at the measurement locations, whilst the contribution of the vehicle lights seems to be significantly smaller.

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Hand, Tanis. "Don’t be shy—at work or at an event, share what you know …" British Journal of Healthcare Assistants 6, no. 11 (November 2012): 526. http://dx.doi.org/10.12968/bjha.2012.6.11.526.

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He, Y. Z., and C. G. Bao. "Periodic giant persistent current in sharp pulses on a ring." Canadian Journal of Physics 87, no. 4 (April 2009): 353–57. http://dx.doi.org/10.1139/p09-009.

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We show here a mesoscopic device based on a narrow ring containing an electron. In the device, an amount of energy is stored in advance. Similar to a pendulum, an exact periodic motion of the electron is thereby initiated. The motion appears as a series of sharp pulses and is in nature different from the well-known Aharonov–Bohm (A–B) oscillation. In particular, the current pulses can be tuned to be very strong (say, more than two orders of magnitude stronger than the usual A–B current). Related theory and numerical results are presented.

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Gupta, Divam, Tanmoy Chakraborty, and Soumen Chakrabarti. "GIRNet: Interleaved Multi-Task Recurrent State Sequence Models." Proceedings of the AAAI Conference on Artificial Intelligence 33 (July 17, 2019): 6497–504. http://dx.doi.org/10.1609/aaai.v33i01.33016497.

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In several natural language tasks, labeled sequences are available in separate domains (say, languages), but the goal is to label sequences with mixed domain (such as code-switched text). Or, we may have available models for labeling whole passages (say, with sentiments), which we would like to exploit toward better position-specific label inference (say, target-dependent sentiment annotation). A key characteristic shared across such tasks is that different positions in a primary instance can benefit from different ‘experts’ trained from auxiliary data, but labeled primary instances are scarce, and labeling the best expert for each position entails unacceptable cognitive burden. We propose GIRNet, a unified position-sensitive multi-task recurrent neural network (RNN) architecture for such applications. Auxiliary and primary tasks need not share training instances. Auxiliary RNNs are trained over auxiliary instances. A primary instance is also submitted to each auxiliary RNN, but their state sequences are gated and merged into a novel composite state sequence tailored to the primary inference task. Our approach is in sharp contrast to recent multi-task networks like the crossstitch and sluice networks, which do not control state transfer at such fine granularity. We demonstrate the superiority of GIRNet using three applications: sentiment classification of code-switched passages, part-of-speech tagging of codeswitched text, and target position-sensitive annotation of sentiment in monolingual passages. In all cases, we establish new state-of-the-art performance beyond recent competitive baselines.

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Schmidt, T., J. Kalisch, E. Lorenz, and D. Heinemann. "Evaluating the spatio-temporal performance of sky imager based solar irradiance analysis and forecasts." Atmospheric Chemistry and Physics Discussions 15, no. 19 (October 7, 2015): 26997–7039. http://dx.doi.org/10.5194/acpd-15-26997-2015.

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Abstract. Clouds are the dominant source of variability in surface solar radiation and uncertainty in its prediction. However, the increasing share of solar energy in the world-wide electric power supply increases the need for accurate solar radiation forecasts. In this work, we present results of a shortest-term global horizontal irradiance (GHI) forecast experiment based on hemispheric sky images. A two month dataset with images from one sky imager and high resolutive GHI measurements from 99 pyranometers distributed over 10 km by 12 km is used for validation. We developed a multi-step model and processed GHI forecasts up to 25 min with an update interval of 15 s. A cloud type classification is used to separate the time series in different cloud scenarios. Overall, the sky imager based forecasts do not outperform the reference persistence forecasts. Nevertheless, we find that analysis and forecast performance depend strongly on the predominant cloud conditions. Especially convective type clouds lead to high temporal and spatial GHI variability. For cumulus cloud conditions, the analysis error is found to be lower than that introduced by a single pyranometer if it is used representatively for the whole area in distances from the camera larger than 1–2 km. Moreover, forecast skill is much higher for these conditions compared to overcast or clear sky situations causing low GHI variability which is easier to predict by persistence. In order to generalize the cloud-induced forecast error, we identify a variability threshold indicating conditions with positive forecast skill.

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Borg, Sarah M., Steven M. Cavallo, and David D. Turner. "Characteristics of Tropopause Polar Vortices Based on Observations over the Greenland Ice Sheet." Journal of Applied Meteorology and Climatology 59, no. 11 (November 2020): 1933–47. http://dx.doi.org/10.1175/jamc-d-20-0004.1.

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AbstractTropopause polar vortices (TPVs) are long-lived, coherent vortices that are based on the dynamic tropopause and characterized by potential vorticity anomalies. TPVs exist primarily in the Arctic, with potential impacts ranging from surface cyclone generation and Rossby wave interactions to dynamic changes in sea ice. Previous analyses have focused on model output indicating the importance of clear-sky and cloud-top radiative cooling in the maintenance and evolution of TPVs, but no studies have focused on local observations to confirm or deny these results. This study uses cloud and atmospheric state observations from Summit Station, Greenland, combined with single-column experiments using the Rapid Radiative Transfer Model to investigate the effects of clear-sky, ice-only, and all-sky radiative cooling on TPV intensification. The ground-based observing system combined with temperature and humidity profiles from the European Centre for Medium-Range Weather Forecasts’s fifth major global reanalysis dataset, which assimilates the twice-daily soundings launched at Summit, provides novel details of local characteristics of TPVs. Longwave radiative contributions to TPV diabatic intensity changes are analyzed with these resources, starting with a case study focusing on observed cloud properties and associated radiative effects, followed by a composite study used to evaluate observed results alongside previously simulated results. Stronger versus weaker vertical gradients in anomalous clear-sky radiative heating rates, contributing to Ertel potential vorticity changes, are associated with strengthening versus weakening TPVs. Results show that clouds are sometimes influential in the intensification of a TPV, and composite results share many similarities to modeling studies in terms of atmospheric state and radiative structure.

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Schmidt, Thomas, John Kalisch, Elke Lorenz, and Detlev Heinemann. "Evaluating the spatio-temporal performance of sky-imager-based solar irradiance analysis and forecasts." Atmospheric Chemistry and Physics 16, no. 5 (March 15, 2016): 3399–412. http://dx.doi.org/10.5194/acp-16-3399-2016.

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Abstract. Clouds are the dominant source of small-scale variability in surface solar radiation and uncertainty in its prediction. However, the increasing share of solar energy in the worldwide electric power supply increases the need for accurate solar radiation forecasts. In this work, we present results of a very short term global horizontal irradiance (GHI) forecast experiment based on hemispheric sky images. A 2-month data set with images from one sky imager and high-resolution GHI measurements from 99 pyranometers distributed over 10 km by 12 km is used for validation. We developed a multi-step model and processed GHI forecasts up to 25 min with an update interval of 15 s. A cloud type classification is used to separate the time series into different cloud scenarios. Overall, the sky-imager-based forecasts do not outperform the reference persistence forecasts. Nevertheless, we find that analysis and forecast performance depends strongly on the predominant cloud conditions. Especially convective type clouds lead to high temporal and spatial GHI variability. For cumulus cloud conditions, the analysis error is found to be lower than that introduced by a single pyranometer if it is used representatively for the whole area in distances from the camera larger than 1–2 km. Moreover, forecast skill is much higher for these conditions compared to overcast or clear sky situations causing low GHI variability, which is easier to predict by persistence. In order to generalize the cloud-induced forecast error, we identify a variability threshold indicating conditions with positive forecast skill.

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Zarzuela, Santiago. "A generalization of a theorem of Sharp on big Cohen-Macaulay modules." Mathematical Proceedings of the Cambridge Philosophical Society 108, no. 2 (September 1990): 193–95. http://dx.doi.org/10.1017/s0305004100069061.

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Let (A, m) be a (commutative, Noetherian) local ring, and a1, …, an a system of parameters for A. Let M be an A-module. We say that M is a big Cohen-Macaulay module with respect to a1, …, an if a1, …, an, is an M-sequence. In this case we call M balanced if any system of parameters for A is an M-sequence.

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Lovell, Sue. "Shadowing Vida Lahey: Bats, Books and Biographical Method." Queensland Review 21, no. 1 (May 8, 2014): 72–83. http://dx.doi.org/10.1017/qre.2014.9.

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In bumper-to-bumper traffic along the Pacific Motorway at dusk, I edge south past the Logan Road exit towards the Gold Coast. Vehicles moving easily north have already put their headlights on. Flying foxes are massing against the darkening sky. These native megabats will find their way to food using their sharp eyes and sense of smell. As I watch, I am reminded of the microbats of another hemisphere. Those blind bats had prompted Thomas Nagel's famous paper, ‘What is it like to be a bat?’

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Jane, Parker, Vaucher, and Berman. "Characterizing Meteorological Forecast Impact on Microgrid Optimization Performance and Design." Energies 13, no. 3 (January 25, 2020): 577. http://dx.doi.org/10.3390/en13030577.

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A microgrid consists of electrical generation sources, energy storage assets, loads, and the ability to function independently, or connect and share power with other electrical grids. Thefocus of this work is on the behavior of a microgrid, with both diesel generator and photovoltaic resources, whose heating or cooling loads are influenced by local meteorological conditions. Themicrogrid's fuel consumption and energy storage requirement were then examined as a function of the atmospheric conditions used by its energy management strategy (EMS). A fuel-optimal EMS, able to exploit meteorological forecasts, was developed and evaluated using a hybrid microgrid simulation. Weather forecast update periods ranged from 15 min to 24 h. Four representative meteorological sky classifications (clear, partly cloudy, overcast, or monsoon) were considered. Forall four sky classifications, fuel consumption and energy storage requirements increased linearly with the increasing weather forecast interval. Larger forecast intervals lead to degraded weather forecasts, requiring more frequent charging/discharging of the energy storage, increasing both the fuel consumption and energy storage design requirements. The significant contributions of this work include the optimal EMS and an approach for quantifying the meteorological forecast effects on fuel consumption and energy storage requirements on microgrid performance. The findings of this study indicate that the forecast interval used by the EMS affected both fuel consumption and energy storage requirements, and that the sensitivity of these effects depended on the 24-hour sky conditions.

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Dale, Hannah, Bronagh Raftery, and Heather Locke. "Behaviour change and sexual health; SHARE programme evaluation." Health Education 114, no. 1 (December 20, 2013): 2–19. http://dx.doi.org/10.1108/he-12-2012-0056.

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Purpose – The purpose of this paper is to examine a national sexual health and relationships education (SHARE) educational package for behaviour change techniques (BCTs) utilised in order to make recommendations for further improvements. Design/methodology/approach – Using BCTs taxonomy (BCT V1), two coders independently examined the 22 session plans within SHARE for their utilisation of BCTs. All three authors then examined the results, and agreed on any discrepancies. Findings – The SHARE package utilises only a small range of BCTs detailed in BCT V1. SHARE makes use of a range of techniques which may impact on the distal factors that influence sexual risk taking, such as self-esteem and building confidence to say “no” to sex. Practical implications – SHARE – and perhaps other sexual health education programmes – may need to draw on more BCTs, particularly those supported by evidence, in order to effectively reduce risky sexual behaviours among young people. Programmes may also benefit from including broader elements around pleasure, self-examination and screening behaviour. Originality/value – Sexual health packages rarely encounter such scrutiny, particularly being examined in relation to the BCTs. The new and rigorous way of rating the SHARE package has enabled a range of recommendations relating to BCTs to be made both for improving the package and other sexual health education programmes.

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Trimble, V. "An Overview of Wide Field Imaging." Symposium - International Astronomical Union 161 (1994): 745–51. http://dx.doi.org/10.1017/s0074180900048476.

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Wide field imaging can be subdivided in terms of wavelengths, the kinds of emission sought, data types, richness of field, detector types, astronomical objects to be investigated, and probably other ways. These are surveyed with special reference to the talks given in Potsdam, ending with a handful of issues about which disagreement, or at least discussion, persists. Wide field can mean many things. V. Lipovetsky defined it as imaging with 107–8 elements or pixels per field. There are other possibilities. For neutrinos, gravitational radiation, cosmic rays, and (some kinds of) gamma rays, the whole sky is a single (very wide) field. At the other extreme, the HST ‘wide field’ camera covers about 2′ and needs nearly 4 × 107 exposures to survey the sky. In between, the POSS and ESO/SERC Schmidt plates see 6° at a gulp, interestingly similar to the roughly 6° sharp central cone of human vision (you can test this by holding a book at a measured distance from your face and counting how many times your eyes jump in reading a line).

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Kim, Young Doo. "Moderators of the Relationship between Customer Satisfaction and Customer Share: The Case of Ski Resorts." Korean Academic Association of Business Administration 32, no. 6 (June 30, 2019): 1067–86. http://dx.doi.org/10.18032/kaaba.2019.32.6.1067.

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Esposito, S., A. Puglisi, E. Pinna, G. Agapito, F. Quirós-Pacheco, J. P. Véran, and G. Herriot. "On-sky correction of non-common path aberration with the pyramid wavefront sensor." Astronomy & Astrophysics 636 (April 2020): A88. http://dx.doi.org/10.1051/0004-6361/201937033.

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The paper deals with with the on-sky performance of the pyramid wavefront sensor-based Adaptive Optics (AO) systems. These wavefront sensors are of great importance, being used in all first light AO systems of the ELTs (E-ELT, GMT, and TMT), currently in design phase. In particular, non-common path aberrations (NCPAs) are a critical issue encountered when using an AO system to produce corrected images in an associated astronomical instrument. The AO wavefront sensor (WFS) and the supported scientific instrument typically use a series of different optical elements, thus experiencing different aberrations. The usual way to correct for such NCPAs is to introduce a static offset in the WFS signals. In this way, when the AO loop is closed the sensor offsets are zeroed and the deformable mirror converges to the shape required to null the NCPA. The method assumes that the WFS operation is linear and completely described by some pre-calibrated interaction matrix. This is not the case for some frequently used wavefront sensors like the Pyramid sensor or a quad-cell Shack-Hartmann sensor. Here we present a method to work in closed-loop with a pyramid wavefront sensor, or more generally a non-linear WFS, introducing a wavefront offset that remains stable when AO correction quality changes due to variations in external conditions like star brightness, seeing, and wind speed. The paper details the methods with analytical and numerical considerations. Then we present results of tests executed at the LBT telescope, in daytime and on sky, using the FLAO system and LUCI2 facility instrument. The on-sky results clearly show the successful operation of the method that completely nulls NCPA, recovering diffraction-limited images with about 70% Strehl ratio in H band in variable seeing conditions. The proposed method is suitable for application to the above-mentioned ELT AO systems.

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Tian, H. J., M. C. Neyrinck, T. Budavári, and A. S. Szalay. "The Enhancement of BAO in the SDSS MGS." Proceedings of the International Astronomical Union 11, S319 (August 2015): 145. http://dx.doi.org/10.1017/s1743921315010042.

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AbstractWe show that redshift-space distortions of galaxy correlations have a strong effect on correlation functions with the signature of the Baryon Acoustic Oscillations (BAO). Near the line of sight, the features become sharper as a result of redshift-space distortions. We analyze the SDSS DR7 main-galaxy sample (MGS), splitting the sample into slices 2.5 deg on the sky in various rotations. Measuring 2D correlation functions in each slice, we do see a sharp bump along the line of sight. Using Mexican-hat wavelets, we localize it to (110 ± 10) h − 1 Mpc and estimate its significance at about 4σ.

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Falk, Martin, and Robert Steiger. "Size facilitates profitable ski lift operations." Tourism Economics 26, no. 7 (August 18, 2019): 1197–211. http://dx.doi.org/10.1177/1354816619868117.

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The book profits of 220 ski lift operators in Austria are analysed in order to identify the determinants relevant for business success. The median ratio of accounting profits to total assets was zero in 2013, while 43% had negative ‘book’ profits and another 12% had zero profits. Results using quantile regressions show that the ratio of book profits to total assets depends significantly on total length of ski slopes (size), maximum altitude of ski lifts, presence of a neighbour close by, the availability of nearby accommodation and the share of foreign overnight stays. Size usually has the greatest effect, which is even more pronounced in the lower part of the conditional distribution of the book profit ratio. Since size is the most important driver of the profit ratio, it can be expected that the pressure on, so far, untapped high alpine terrain will increase in the future.

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Smeltink, Job, Sybert Stroeve, and Barry Kirwan. "Advancing Safety in Organisations: Application via the Luton Safety Stack." MATEC Web of Conferences 273 (2019): 01002. http://dx.doi.org/10.1051/matecconf/201927301002.

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Controlling and improving safety in organisations is achieved using a Safety Management System (SMS). Notwithstanding the variety of components considered in SMS standards, including human factors and safety culture, safety management systems are sometimes observed by those at the ‘sharp end’ as being bureaucratic, distinct from actual operations, and being too focused on the prevention of deviations from procedures, rather than on the effective support of safety in the real operational context. The soft parts of advancing safety in organisations, such as the multitude of interrelations and the informal aspects in an organisation that influence safety, are only considered to a limited extent in traditional safety management systems. The research in Future Sky Safety Project 5 (FSS P5) focused on improving these human-related, informal organisational aspects. Since every organisation is unique, in the operations it conducts, its history, and its organisational culture, there cannot be a one-size-fits-all standard for advancing safety in organisations. Rather, this needs to be based on the organisation at hand, leading to tailored solutions. This has been applied to a safety culture assessment and enhancement approach applied for six key organisations at London Luton Airport, and the approach has become known as the Luton Safety Stack. The six organisations decided to share the detailed results of their individual safety culture assessments. They formed a group that holds quarterly meetings, which always include a workshop element. From this approach, the organisations were stimulated to develop harmonised procedures for all ground-handling operators at Luton, and for each operation, creating a simple one-page procedure with diagrams, to keep it simple and safe. The Luton Safety Stack shows that when organisations share a place, such as at an airport, they need the opportunity to meet to discuss both potential safety threats, and opportunities to advance safety, because even through organisations are interdependent, safety issues in one organisation often have implications for others.

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Waller, Matthew A., Brent D. Williams, Andrea Heintz Tangari, and Scot Burton. "Marketing at the retail shelf: an examination of moderating effects of logistics on SKU market share." Journal of the Academy of Marketing Science 38, no. 1 (May 15, 2009): 105–17. http://dx.doi.org/10.1007/s11747-009-0146-0.

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Duchscher, Towani. "One's Freedom is Another's Cage." Cultural and Pedagogical Inquiry 12, no. 1 (February 1, 2021): 180–99. http://dx.doi.org/10.18733/cpi29544.

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This work challenges the ways that people, predominantly white men, use their bodies and voices to centre themselves in public spaces and identifies the reactions of others to centre the men as well. By paying attention to my somatic knowledge and embodied experiences, I developed a more intricate understanding of the concept of “colonizing the space.” Through poetry, I share lived experiences of this phenomenon in an effort to draw attention to how we engage with each other in our communities and public spaces. As importantly, I imagine and celebrate responses that do not cage or marginalize our voices and bodies but “claim the sky” (Angelou, 1983, p. 19) and sing.

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Noh, Youngmin, Detlef Müller, Kyunghwa Lee, Kwanchul Kim, Kwonho Lee, Atsushi Shimizu, Itaru Sano, and Chan Bong Park. "Depolarization ratios retrieved by AERONET sun–sky radiometer data and comparison to depolarization ratios measured with lidar." Atmospheric Chemistry and Physics 17, no. 10 (May 22, 2017): 6271–90. http://dx.doi.org/10.5194/acp-17-6271-2017.

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Abstract. The linear particle depolarization ratios at 440, 675, 870, and 1020 nm were derived using data taken with the AERONET sun–sky radiometer at Seoul (37.45° N, 126.95° E), Kongju (36.47° N, 127.14° E), Gosan (33.29° N, 126.16° E), and Osaka (34.65° N, 135.59° E). The results are compared to the linear particle depolarization ratio measured by lidar at 532 nm. The correlation coefficient R2 between the linear particle depolarization ratio derived by AERONET data at 1020 nm and the linear particle depolarization ratio measured with lidar at 532 nm is 0.90, 0.92, 0.79, and 0.89 at Seoul, Kongju, Gosan, and Osaka, respectively. The correlation coefficients between the lidar-measured depolarization ratio at 532 nm and that retrieved by AERONET at 870 nm are 0.89, 0.92, 0.76, and 0.88 at Seoul, Kongju, Gosan, and Osaka, respectively. The correlation coefficients for the data taken at 675 nm are lower than the correlation coefficients at 870 and 1020 nm, respectively. Values are 0.81, 0.90, 0.64, and 0.81 at Seoul, Kongju, Gosan, and Osaka, respectively. The lowest correlation values are found for the AERONET-derived linear particle depolarization ratio at 440 nm, i.e., 0.38, 0.62, 0.26, and 0.28 at Seoul, Kongju, Gosan, and Osaka, respectively. We should expect a higher correlation between lidar-measured linear particle depolarization ratios at 532 nm and the ones derived from AERONET at 675 and 440 nm as the lidar wavelength is between the two AERONET wavelengths. We cannot currently explain why we find better correlation between lidar and AERONET linear particle depolarization ratios for the case that the AERONET wavelengths (675, 870, and 1020 nm) are significantly larger than the lidar measurement wavelength (532 nm). The linear particle depolarization ratio can be used as a parameter to obtain insight into the variation of optical and microphysical properties of dust when it is mixed with anthropogenic pollution particles. The single-scattering albedo increases with increasing measurement wavelength for low linear particle depolarization ratios, which indicates a high share of fine-mode anthropogenic pollution. In contrast, single-scattering albedo increases with increasing wavelength for high linear particle depolarization ratios, which indicated a high share of coarse-mode mineral dust particles. The retrieved volume particle size distributions are dominated by the fine-mode fraction if linear particle depolarization ratios are less than 0.15 at 532 nm. The fine-mode fraction of the size distributions decreases and the coarse-mode fraction of the size distribution increases for increasing linear particle depolarization ratio at 1020 nm. The dust ratio based on using the linear particle depolarization ratio derived from AERONET data is 0.12 to 0.17. These values are lower than the coarse-mode fraction derived from the volume concentrations of particle size distributions, in which case we can compute the coarse-mode fraction of dust.

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Maharaj, Rookmin. "View from the top: what directors say about board process." Corporate Governance: The international journal of business in society 9, no. 3 (June 12, 2009): 326–38. http://dx.doi.org/10.1108/14720700910964370.

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PurposeThis paper aims to use the argument that formal regulations alone may not be the defining factor in improving corporate governance and the decision making process of the BOD.Design/methodology/approachBased on 20 semi‐structured interviews with board chairs, members of corporate boards, CEOs, and upper/executive management at 12 Canadian companies, a bird's eye view is taken from the top. A content analysis of the interviews was performed. a clear picture about the interaction and behaviour of directors emerged. Subsequently, three objectives that are required for effective decision‐making were developed: knowledge; motivation; and transmission channels/internal control. The analysis offers three critical objectives, which all boards should endeavour to accomplish.FindingsThese interviews demystify board process and provide the bases for three critical objectives for effective corporate governance: ascertain and embellish the knowledge base of directors; motivate directors to share and gather information; and ensure clear and fluent transmission channels exist.Practical implicationsThe usual board measures such as CEO duality, insider and outsider ratio, number of board members and directors' share ownership may not be the only critical determinants of board effectiveness.Originality/valueConventional notions of decision making have neglected key human faculties and individual characteristics that combine to determine organizational outcomes. This paper fulfils a need for research in the area of board processes and board decision making and provides a roadmap to improve corporate governance within organizations.

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Kaneko, Kotaro J., Theo Rein, Zong-Sheng Guo, Keith Latham, and Melvin L. DePamphilis. "DNA Methylation May Restrict but Does Not Determine Differential Gene Expression at the Sgy/Tead2 Locus during Mouse Development." Molecular and Cellular Biology 24, no. 5 (March 1, 2004): 1968–82. http://dx.doi.org/10.1128/mcb.24.5.1968-1982.2004.

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ABSTRACT Soggy (Sgy) and Tead2, two closely linked genes with CpG islands, were coordinately expressed in mouse preimplantation embryos and embryonic stem (ES) cells but were differentially expressed in differentiated cells. Analysis of established cell lines revealed that Sgy gene expression could be fully repressed by methylation of the Sgy promoter and that DNA methylation acted synergistically with chromatin deacetylation. Differential gene expression correlated with differential DNA methylation, resulting in sharp transitions from methylated to unmethylated DNA at the open promoter in both normal cells and tissues, as well as in established cell lines. However, neither promoter was methylated in normal cells and tissues even when its transcripts were undetectable. Moreover, the Sgy promoter remained unmethylated as Sgy expression was repressed during ES cell differentiation. Therefore, DNA methylation was not the primary determinant of Sgy/Tead2 expression. Nevertheless, Sgy expression was consistently restricted to basal levels whenever downstream regulatory sequences were methylated, suggesting that DNA methylation restricts but does not regulate differential gene expression during mouse development.

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Bitto, Adenike, Jacquelyn A. Hakim, and M. F. Pula. "What Seniors Say About West Nile Virus." Californian Journal of Health Promotion 3, no. 3 (September 1, 2005): 127–36. http://dx.doi.org/10.32398/cjhp.v3i3.651.

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Public health surveillance reports indicate that the recent rapid population increase among senior citizens is accompanied by a nationwide spread of West Nile virus (WNV), an emerging disease that poses a threat to the elderly. Information gathered from senior citizens in the County, showed that overall, 81.6% of seniors knew that WNV is spread to humans through the bite of an infected mosquito; but only 63.2% knew that older adults have a higher risk of severe complications from WNV infection. A tailored health education outreach program, based on the health belief model and epidemiologic triad, was implemented to share about WNV infection prevention and control. This included the reduction of mosquito breeding and bites; improved use of personal protective measures for outdoor exposures at dusk and at night; and use of repellants. Because the threat of WNV is not over, it is important to keep seniors and other vulnerable populations involved in issues that affect their health, community, and environment

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Wu, Xiao Tian, Xing Hao Ding, and Quan Xiao. "A Modified Haze Removal Algorithm Using Dark Channel Prior." Advanced Materials Research 457-458 (January 2012): 1397–402. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.1397.

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In this paper, we propose a new algorithm to remove haze from a single input image. Based on the Dark Channel Prior proposed by He [1], we exploit the Gauss Bilateral Filter and the min operation to obtain an edge-preserving dark channel image, which is non-iterative, requires less time. We further utilize this dark channel image to extract the estimation of medium transmission, and finally recover a haze-free image from that. Furthermore, we use a self-adaptive algorithm to set the haze parameters to solve the color shift problem for large sky region. Experiments demonstrate our algorithm can effectively remove haze from a foggy image while keep edges sharp.

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Journal articles on the topic 'Sky Shark'

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